Operation button for elevator



FIG. 1 is a perspective view of the front, right, and top side of an operation button for elevator showing my design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a reference view for showing use situation.

The broken lines depict portions of the operation button for elevator that form no part of the claimed design. 

CLAIM The ornamental design for an operation button for elevator, as shown and described. 